I was having the extact same problem. And it came down to simply restart the cmd window by closing and opening it again.
Of course, you may need if not already done to install Gettext for Windows 0.15 or higher from these sources :
http://mlocati.github.io/gettext-iconv-windows/
To see how I compiled them (if you want to do it yourself) take a look at https://github.com/mlocati/gettext-iconv-windows (source)
Make sure also that the path to your gettext is in your system $PATH (python >> import sys >> print sys.path) - if not, you can add in your virtualenv folder Lib\site-packages a .pth file containing the path to your gettext folder.
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